> > + * increase 'nr_consumed_maps' whether its allocation of memmap > > + * or usemap failed or not, so that after we handle the i-th > > + * memory section, can get memmap and usemap of (i+1)-th section > > + * correctly. */ > > This makes no sense to me. Why are we incrementing 'nr_consumed_maps' > when we do not consume one? > > You say that we increment it so that things will work, but not how or > why it makes things work. I'm confused.
Hi Dave, nr_consumed_maps is a local counter. map_map contains struct pages for each section. In order to assign them to correct sections this local counter must be incremented even when some parts of map_map are empty. Here is example: Node1: map_map[0] -> Struct pages ... map_map[1] -> NULL Node2: map_map[2] -> Struct pages ... We always want to configure section from Node2 with struct pages from Node2. Even, if there are holes in-between. The same with usemap. Pavel
